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<dxl:Comment><![CDATA[
OBjective: There should be no motion on top of the append node as the child of append node are alredy distributed on the grouping columns.
CREATE TABLE foo (a int, b int);
EXPLAIN WITH ss AS
  (SELECT b,
          1 AS c
   FROM foo
   GROUP BY b),
             cs AS
  (SELECT b,
          1 AS c
   FROM foo
   WHERE b IN
       (SELECT b
        FROM foo)
   GROUP BY b),
             ws AS
  (SELECT b,
          1 AS c
   FROM foo
   WHERE b IN
       (SELECT b
        FROM foo)
   GROUP BY b)
SELECT b,
       1 AS c
FROM
  (SELECT *
   FROM ss
   UNION ALL SELECT *
   FROM cs
   UNION ALL SELECT *
   FROM ws) tmp1
GROUP BY b;
    ]]>
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                          <dxl:Sort SortDiscardDuplicates="false">
                            <dxl:Properties>
                              <dxl:Cost StartupCost="0" TotalCost="862.000345" Rows="1.000000" Width="4"/>
                            </dxl:Properties>
                            <dxl:ProjList>
                              <dxl:ProjElem ColId="77" Alias="b">
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                            <dxl:SortingColumnList>
                              <dxl:SortingColumn ColId="77" SortOperatorMdid="0.97.1.0" SortOperatorName="&lt;" SortNullsFirst="false"/>
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                            <dxl:LimitCount/>
                            <dxl:LimitOffset/>
                            <dxl:HashJoin JoinType="In">
                              <dxl:Properties>
                                <dxl:Cost StartupCost="0" TotalCost="862.000345" Rows="1.000000" Width="4"/>
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                              <dxl:ProjList>
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                              <dxl:JoinFilter/>
                              <dxl:HashCondList>
                                <dxl:Comparison ComparisonOperator="=" OperatorMdid="0.96.1.0">
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                                  <dxl:Ident ColId="88" ColName="b" TypeMdid="0.23.1.0"/>
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                              </dxl:HashCondList>
                              <dxl:TableScan>
                                <dxl:Properties>
                                  <dxl:Cost StartupCost="0" TotalCost="431.000007" Rows="1.000000" Width="4"/>
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                                <dxl:ProjList>
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                                <dxl:Filter/>
                                <dxl:TableDescriptor Mdid="6.532490.1.0" TableName="foo">
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                                    <dxl:Column ColId="86" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
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                                </dxl:TableDescriptor>
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                              <dxl:BroadcastMotion InputSegments="0,1,2" OutputSegments="0,1,2">
                                <dxl:Properties>
                                  <dxl:Cost StartupCost="0" TotalCost="431.000081" Rows="3.000000" Width="4"/>
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                                <dxl:ProjList>
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                                    <dxl:Ident ColId="88" ColName="b" TypeMdid="0.23.1.0"/>
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                                </dxl:ProjList>
                                <dxl:Filter/>
                                <dxl:SortingColumnList/>
                                <dxl:TableScan>
                                  <dxl:Properties>
                                    <dxl:Cost StartupCost="0" TotalCost="431.000007" Rows="1.000000" Width="4"/>
                                  </dxl:Properties>
                                  <dxl:ProjList>
                                    <dxl:ProjElem ColId="88" Alias="b">
                                      <dxl:Ident ColId="88" ColName="b" TypeMdid="0.23.1.0"/>
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                                  </dxl:ProjList>
                                  <dxl:Filter/>
                                  <dxl:TableDescriptor Mdid="6.532490.1.0" TableName="foo">
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                                      <dxl:Column ColId="89" Attno="-1" ColName="ctid" TypeMdid="0.27.1.0" ColWidth="6"/>
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                                      <dxl:Column ColId="91" Attno="-4" ColName="cmin" TypeMdid="0.29.1.0" ColWidth="4"/>
                                      <dxl:Column ColId="92" Attno="-5" ColName="xmax" TypeMdid="0.28.1.0" ColWidth="4"/>
                                      <dxl:Column ColId="93" Attno="-6" ColName="cmax" TypeMdid="0.29.1.0" ColWidth="4"/>
                                      <dxl:Column ColId="94" Attno="-7" ColName="tableoid" TypeMdid="0.26.1.0" ColWidth="4"/>
                                      <dxl:Column ColId="95" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
                                    </dxl:Columns>
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                              </dxl:BroadcastMotion>
                            </dxl:HashJoin>
                          </dxl:Sort>
                        </dxl:Aggregate>
                      </dxl:RedistributeMotion>
                    </dxl:Sort>
                  </dxl:Aggregate>
                </dxl:Result>
              </dxl:Append>
            </dxl:Sort>
          </dxl:Aggregate>
        </dxl:Result>
      </dxl:GatherMotion>
    </dxl:Plan>
  </dxl:Thread>
</dxl:DXLMessage>
